no compatible source was found for this media

18.04 firefox

  1. Option 1:

    Try sudo apt install libavcodec-extra

    According to this answer: Firefox html5 video support

    Restart Firefox when you are done.

  2. Option 2:

    Installing GStreamer Multimedia Codecs


The media codecs for ubuntu are not installed by default. Install the media codecs by

sudo apt-get install ubuntu-restricted-extras

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